office 365 add/remove secondary smtp account to user

i would like to add/remove secondary smtp account in office 365 but it si ad synch.

how i can do it from powershell?
Mark SoultchAsked:
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Jian An LimSolutions ArchitectCommented:
Disclaimer: code was a copy paste from some other website so don't use it without think through what it is going to do.

The idea is the 2 field you need to change is mail attribute (if you want to change the primary domain) and proxyaddresses attribute (for multiple email address for a user)

I usually change this in attribute editor from ACtive Directory User Computer but you can do it via powershell below

you can use either via powershell stle ldap

               $aduser = get-aduser -identity xxxxxxx
                #    append value to proxyaddress array using ADSI Edit connector
                $user = [ADSI]"LDAP://$($aduser.distinguishedname)"
                $ads_property_append = 3
                $user.Putex($ads_property_append, "proxyaddresses",  @("smtp:$($aduser.emailaddress)"))

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or via powershell

$user = Get-ADUser GlenJohn -Properties mail,department,ProxyAddresses
$user.ProxyAddresses = ""   ## or maybe use += to have multiple of proxyaddresses
Set-ADUser -instance $user 

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Jian An LimSolutions ArchitectCommented:
Also remember (i know you will), since you add additional domain, you need to verify that domain on office 365 and change the MX record accordingly for the full solution to work
Mark SoultchAuthor Commented:
in active directory in which position you update the information for the user???
Jian An LimSolutions ArchitectCommented:
if you open in ADUC,
make sure you have Advanced Features ticked

then you can double click any users object (not through find windows though)
you should see attribute editor tab

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